Ternary alkaline-earth pyrosilicate luminescent materials activated with divalent europium

Abstract

Abstract Several ternary pyrosilicate compositions of the system MO-MgOSiO2 (M Sr, Ba, Ca) of the general formula M2MgSi2O7 were activated with divalent europium while maintaining the charge balance. Under cathode-ray, and long- and short-wavelength ultraviolet excitation, they show green and/or blue emission depending on the matrix involved. In the phosphors not containing barium, equivalent amounts of magnesium and silicon can be replaced by aluminum and the charge balance maintained. Some embodiments, especially those with high barium content, show good temperature-dependence characteristics, and this phosphor system is useful in fluorescent and high pressure mercury vapor lamps.

Inventors

• 👤 Ranajit Kumar Datta

Bibliographic Details